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</head>
<body>
<div id="header">
<h1>NVIDIA Memory Clock Table Specifications</h1>
</div>
<div id="preamble">
<div class="sectionbody">
</div>
</div>
<h2 id="_purpose">Purpose</h2>
<div class="sectionbody">
<div class="paragraph"><p>This document describes the VBIOS Memory clock table entries.
The Memory Clock Table starts with a header, followed immediately by an array of entries.</p></div>
<h3 id="_memory_clock_table_header">Memory Clock Table Header</h3><div style="clear:left"></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="border"
cellspacing="0" cellpadding="4">
<col width="22%" />
<col width="11%" />
<col width="66%" />
<thead>
<tr>
<th align="left" valign="top"> FieldName </th>
<th align="center" valign="top"> Size (in bits)  </th>
<th align="left" valign="top"> Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p class="table">Version</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
Memory Clock Table Version (0x11)
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Header Size</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
Size of Memory Clock Table Header in bytes (26)
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Base Entry Size</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
Size of Memory Clock Table Base Entry in bytes (20)
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Strap Entry Size</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
Size of Memory Clock Table Strap Entry in bytes (26)
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Strap Entry Count</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
Number of Memory Clock Table Strap Entries per Memory Clock Table Entry
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Entry Count</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
Number of Memory Clock Table Entries (combined Base Entry plus Strap Entry Count of Strap Entries)
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Reserved</p></td>
<td align="center" valign="top"><p class="table">160</p></td>
<td align="left" valign="top"><div></div></td>
</tr>
</tbody>
</table>
</div>
<h3 id="_memory_clock_table_base_entry">Memory Clock Table Base Entry</h3><div style="clear:left"></div>
<div class="paragraph"><p>Each entry is made up of a single Base Entry and multiple Strap Entries. The entire size of an entry is given by ( MemoryClockTableHeader.BaseEntrySize + MemoryClockTableHeader.StrapEntrySize × MemoryClockTableHeader.StrapEntryCount ). Each entry provides information needed for operating the memory at a frequency between MemoryClockTableBaseEntry.Minimum.Frequency and MemoryClockTableBaseEntry.Maximum.Frequency, inclusively.</p></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="border"
cellspacing="0" cellpadding="4">
<col width="22%" />
<col width="11%" />
<col width="66%" />
<thead>
<tr>
<th align="left" valign="top"> FieldName </th>
<th align="center" valign="top"> Size (in bits)  </th>
<th align="left" valign="top"> Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p class="table">Min Frequency</p></td>
<td align="center" valign="top"><p class="table">16</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
[15:14] = Reserved
</dt>
<dt class="hdlist1">
[13:0] = Frequency (MHz)
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Max Frequency</p></td>
<td align="center" valign="top"><p class="table">16</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
[15:14] = Reserved
</dt>
<dt class="hdlist1">
[13:0] = Frequency(MHz)
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Reserved</p></td>
<td align="center" valign="top"><p class="table">40</p></td>
<td align="left" valign="top"><div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Read/Write Config0</p></td>
<td align="center" valign="top"><p class="table">32</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
[8:0] = Read Setting0
</dt>
<dt class="hdlist1">
[17:9] = Write Settings0
</dt>
<dt class="hdlist1">
[19:18] = Reserved
</dt>
<dt class="hdlist1">
[24:20] = ReadSettings1
</dt>
<dt class="hdlist1">
[31:25] = Reserved
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Read/Write Config1</p></td>
<td align="center" valign="top"><p class="table">32</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
[3:0] = Read Settings0
</dt>
<dt class="hdlist1">
[7:4] = Write Settings0
</dt>
<dt class="hdlist1">
[11:8] = Read Settings1
</dt>
<dt class="hdlist1">
[15:12] = Write Settings1
</dt>
<dt class="hdlist1">
[19:16] = Read Settings2
</dt>
<dt class="hdlist1">
[23:20] = Write Settings2
</dt>
<dt class="hdlist1">
[31:24] = Timing Settings0
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Reserved</p></td>
<td align="center" valign="top"><p class="table">24</p></td>
<td align="left" valign="top"><div></div></td>
</tr>
</tbody>
</table>
</div>
<h3 id="_memory_clock_table_strap_entry">Memory Clock Table Strap Entry</h3><div style="clear:left"></div>
<div class="tableblock">
<table rules="all"
width="100%"
frame="border"
cellspacing="0" cellpadding="4">
<col width="22%" />
<col width="11%" />
<col width="66%" />
<thead>
<tr>
<th align="left" valign="top"> FieldName </th>
<th align="center" valign="top"> Size (in bits)  </th>
<th align="left" valign="top"> Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p class="table">MemTweak Index</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
[7:0] MemTweak Index
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Flags0</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
[6:0] = Reserved
</dt>
<dt class="hdlist1">
[7:7] = Alignment Mode
</dt>
<dd>
<p>
            0x0 = Phase detector (Default)<br />
            0x1 = Pin
</p>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Reserved</p></td>
<td align="center" valign="top"><p class="table">48</p></td>
<td align="left" valign="top"><div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Flags4</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
[6:0] = Reserved
</dt>
<dt class="hdlist1">
[7:7] = MRS7 GDDR5
</dt>
<dd>
<p>
            0x0 = Disable (Default)<br />
            0x1 = Enable
</p>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Reserved</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Flags5</p></td>
<td align="center" valign="top"><p class="table">8</p></td>
<td align="left" valign="top"><div><div class="dlist"><dl>
<dt class="hdlist1">
[5:0] = Reserved
</dt>
<dt class="hdlist1">
[6:6] = GDDR5x Internal VrefC
</dt>
<dd>
<p>
            0x0 = Disable (Default) (70% VrefC)<br />
            0x1 = Enable (50% VrefC)
</p>
</dd>
<dt class="hdlist1">
[7:7] = Reserved
</dt>
<dd>
</dd>
</dl></div></div></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">Reserved</p></td>
<td align="center" valign="top"><p class="table">120</p></td>
<td align="left" valign="top"><div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2018-01-26 11:44:35 PDT
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